Heathkit SB-10 Series Troubleshooting Manual page 37

FREQ CONTROL - LOCKED NORMAL
METER - PLATE.
Press the PTT microphone button and turn the BIAS ADJUST control in the Transceiver for a
plate current reading of 50 ma If the meter reads more than 100 ma, do not press the
microphone button more than a few seconds at one time, until the plate current has been
properly adjusted.
If an oscilloscope is not used, preset the RELATIVE POWER control to the center of its range
and turn the METER switch to REL PWR.
With the MODE switch set at the TUNE position, slowly turn the MIC/CW LEVEL control in a
clockwise direction until there is an indication of RF output on the meter or oscilloscope.
Turn the MIC/CW LEVEL control for a low level of RF output, then adjust the DRIVER
PRESELECTOR control for maximum RF output.
Adjust the FINAL tune (round knob) control for maximum RF output.
Turn the MIC/CW LEVEL control counterclockwise to obtain approximately 1/4 maximum
output.
Adjust transformer T1 for maximum RF output. It should not be necessary to adjust this
transformer more than one complete turn.
Turn the MIC/CW LEVEL control and DRIVER PRESELECTOR control to obtain maximum RF
output on the meter or oscilloscope. Then turn the METER switch to GRID (grid current); the
meter should indicate full scale.
Turn the METER switch to the PLATE position.
Adjust the FINAL tune control for minimum plate current. Turn the METER switch to REL PWR
or observe the output on an oscilloscope. Adjust the FINAL tune control for maximum meter
indication and note the position of the FINAL tune control. (If necessary, readjust the RELATIVE
POWER control so the meter does not indicate beyond full scale.) If maximum relative power
and minimum plate current do not occur at the same point of tuning, then turn the neutralizing
capacitor a small amount.
Check the position of the FINAL tune control at minimum plate current and also at the maximum
relative power indication.
The neutralizing capacitor should be adjusted a small amount at a time until minimum plate
current and maximum relative power occur at the same point of tuning the FINAL tune control.
Turn the MIC/CW LEVEL control fully counterclockwise.
Turn the MODE switch to LSB, push the PTT switch on the microphone, then adjust the
CARRIER NULL control for minimum RF output.
NOTE: Readjust the RELATIVE POWER control for more sensitivity if the panel meter is used to indicate relative
power.
Alignment Page 37